main{
	width: 100%;
	height: 4518px;
	background: url(../img/bg.png);
}
main .box1,.box2,.box4{
	width: 100%;
	height: 750px;
}
main img{
	width: 100%;
	height: 100%;
}
main .box3{
	width: 1200px;
	height: 660px;
	margin: 200px auto;
}
main .box5{
	width: 1200px;
	height: 890px;
	margin: 0 auto;
}
